Can we estimate molluscan abundance and biomass on the continental shelf?

Powell, Eric N.; Mann, Roger; Ashton-Alcox, Kathryn A.; Kuykendall, Kelsey M.; Long, Matthew C.

doi:10.1016/j.ecss.2017.09.012

Cited by 21 publications

(7 citation statements)

References 92 publications

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“…O. chilensis do not form reefs, but occur as individuals and small clusters on sand and gravel habitat (see the Supplement). The lack of a stock−recruitment relationship in oysters and other sessile invertebrate stocks suggests that single biological reference point based management may not be appropriate for many of these stocks (after Powell et al 2012). The diminishing stock−recruitment relationship in Foveaux Strait oysters has important implications for the management of Foveaux Strait oyster fishery and invertebrate stocks generally.…”

Section: Discussionmentioning

confidence: 99%

Four-year decline in Ostrea chilensis recruits per spawner in Foveaux Strait, New Zealand, suggests a diminishing stock-recruitment relationship

Michael¹,

Shima²

2018

Mar. Ecol. Prog. Ser.

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Rebuilding and maintaining sufficient spawning stock to ensure recruitment is a key strategy for fisheries management and ecological restoration. We evaluated variation in Ostrea chilensis recruitment across seasons and sites over 4−6 yr in Foveaux Strait (New Zealand) to infer the relative importance of determinants of population recruitment. Recruitment varied significantly between seasons (p < 0.001). Most recruitment in any given year (97.8 ± 0.9%, mean ± SE) occurred in the austral spring and summer (November to February). Recruitment also varied significantly between years (p < 0.001). In a separate fishery-wide study, we investigated the effect of spawner densities on recruitment, relative to other climatic and biological factors. We deployed spat collectors at 6 sites across 3 discrete fishery areas, and estimated densities of spawning-sized oysters from dredge samples. We modelled counts of oyster spat and spawners with a negative binomial regression to evaluate the stock−recruitment relationship. Recruitment varied between years (50.8% of the deviance explained), spawner densities (13.8%), and areas (11.6%), with further 2-way interactions among these factors. Importantly, our analysis showed a continued decline in recruits per spawner, despite similar or increasing densities of spawning-sized oysters. Average recruitment for 2010-11 when spawner densities were highest was 4.6% of the level observed in 2007-08. Our data suggest that factors other than densities of oysters play a major role in the numbers of competent larvae available for settlement. Managing oyster fisheries as a single stock and maintaining oyster densities above management reference points alone may not be sufficient to ensure recruitment to rebuild populations.

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Section: Discussionmentioning

confidence: 99%

Four-year decline in Ostrea chilensis recruits per spawner in Foveaux Strait, New Zealand, suggests a diminishing stock-recruitment relationship

Michael¹,

Shima²

2018

Mar. Ecol. Prog. Ser.

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“…A fixed grid design was chosen to insure that the region was evenly and densely surveyed. Fixed grids are routinely used to evaluate regions initially for later inclusion into a stratified random survey design (e.g., van der Meer, 1997;Morehead, Montagna, & Kennicutt, 2008;HSRL, 2012;Powell, Mann, Ashton-Alcox, Kuykendall, & Long, 2017). A hub-and-spoke fixed grid design was implemented with spokes of 3-nm length (Figure 1), a sampling density approximating the densest sampling grid theoretically achiev- intermingling of species, which, however, structure the habitat into exclusionary stable states rather than overlapping in a co-occurrence ecotone.…”

Section: Survey Location and Designmentioning

confidence: 99%

The intermingling of benthic macroinvertebrate communities during a period of shifting range: The “East of Nantucket” Atlantic Surfclam Survey and the existence of transient multiple stable states

et al. 2019

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A survey of the region eastward of Nantucket provided an opportunity to examine the cold temperate–boreal boundary along the high‐energy Great South Channel. Here described are the benthic macroinvertebrate community types encountered, with a focus on the influence of climate change on the range boundaries of the benthic biomass dominants and the potential existence of transient multiple stable states. The survey identified three primary community types. The shallowest sites were occupied by a surfclam‐dominated community, comprising an abundance of large (≥150 mm) surfclams, and a few common attached epibiota primarily attached to exposed surfclam shell. Two communities exist at intermediate depths, one dominated by submarket and small market‐size surfclams (<150 mm) and the other, created by mussel mats and their attendant epibiota, crabs, sea urchins, and other mobile epifauna. Mussels are a foundational species, establishing a hard‐bottom terrain conducive to these other denizens in soft‐bottom habitat. Cobbles were nearly ubiquitous, rocks were routinely recovered, and boulders were encountered occasionally. Slow growing attached epibionts were exceedingly rare and mobile epifauna were not obviously associated with these large sedimentary particles; nor were the surfclam or mussel communities. The frequency of barnacle scars suggests sediment scour under the high‐flow regime characteristic of the surveyed region, which voids the habitat potential of these sedimentary particles. The abundance of surfclam shell indicates that surfclams have inhabited the shoaler depths for an extended time; limited shell at deeper sites supports the inference from the absence of large animals that these sites are relatively newly colonized and represent further evidence of an offshore shift in range brought on by increasing bottom water temperatures. The dichotomous nature of the two primary community types at mid‐depths suggests that these two communities represent multiple stable states brought on by the interaction of an invading cold temperate species with the receding boreal fauna resulting in a transient intermingling of species, which, however, structure the habitat into exclusionary stable states rather than overlapping in a co‐occurrence ecotone.

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“…The surfclam population is characterized by a patchy distribution, which poses challenges for surveying the stock and tracking the shift in range , Powell et al 2017b). The dynamics of range shifts have been considered, as has the importance of source and sink populations in determining the stability of the leading edge and the potential for genetic variation across the range core to range edge transition (Ibrahim et al 1996, Excoffier et al 2009, Hellberg 2009).…”

Section: Larval Transport-dispersion Gradientmentioning

confidence: 99%

An Overview of Factors Affecting Distribution of the Atlantic Surfclam (Spisula solidissima), a Continental Shelf Biomass Dominant, During a Period of Climate Change

Hofmann

Powell

Klinck

et al. 2018

Journal of Shellfish Research

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Can we estimate molluscan abundance and biomass on the continental shelf?

Cited by 21 publications

References 92 publications

Four-year decline in Ostrea chilensis recruits per spawner in Foveaux Strait, New Zealand, suggests a diminishing stock-recruitment relationship

Four-year decline in Ostrea chilensis recruits per spawner in Foveaux Strait, New Zealand, suggests a diminishing stock-recruitment relationship

The intermingling of benthic macroinvertebrate communities during a period of shifting range: The “East of Nantucket” Atlantic Surfclam Survey and the existence of transient multiple stable states

An Overview of Factors Affecting Distribution of the Atlantic Surfclam (Spisula solidissima), a Continental Shelf Biomass Dominant, During a Period of Climate Change

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